To those who understand state surveillance as an abstraction, I will try to describe a little about how it has affected me. The United States apparently placed me on a “watch-list” in 2006 after I completed a film about the Iraq war. I have been detained at the border more than 40 times. Once, in 2011, when I was stopped at John F. Kennedy International Airport in New York and asserted my First Amendment right not to answer questions about my work, the border agent replied, “If you don’t answer our questions, we’ll find our answers on your electronics.”’ As a filmmaker and journalist entrusted to protect the people who share information with me, it is becoming increasingly difficult for me to work in the United States. Although I take every effort to secure my material, I know the N.S.A. has technical abilities that are nearly impossible to defend against if you are targeted.

The 2008 amendments to the Foreign Intelligence Surveillance Act, which oversees the N.S.A. activities, are up for renewal in December. Two members of the Senate Select Committee on Intelligence, Senators Ron Wyden of Oregon and Mark Udall of Colorado, both Democrats, are trying to revise the amendments to insure greater privacy protections. They have been warning about “secret interpretations” of laws and backdoor “loopholes” that allow the government to collect our private communications. Thirteen senators have signed a letter expressing concern about a “loophole” in the law that permits the collection of United States data. The A.C.L.U. and other groups have also challenged the constitutionality of the law, and the Supreme Court will hear arguments in that case on Oct. 29.